Mao and Stalin have both been awkwardly accepted and/or rehabilitated by their respective countries. Hitler, fairly or not, is still far more of an unambiguous embodiment of evil than the (roughly as murderous) Stalin.

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Hitler - Charismatic and Industrious or Militaristic. Sure he applied those things to horrible and self destructive ends ... but he did inspire a people to build up a lot of infrastructure and military might.